Internal combustion engine



May 11, 1943. R. M ILLER ETAL INTERNAL COMBUSTION ENGINE Filed Feb.11,1942

Patented May 11, 1943 UNITED STAT-ES PATENT OFFICE INTERNAL COMBUSTIONENGINE Application February 11, 1942, Serial No. 430,318

Claims.

This invention relates to internal combustion engines, and moreparticularly to connecting rodbearing box structures for a V-typeengine.

In conventional V-type engines, it is customary to employ a two-piecebearing box, mounted on a crank of the engine crank shaft, to which ispivotally secured a connecting rod for one cylinder, the connecting'rodfor the opposite cylinder being integrally formed with the upper sectionof the bearing box. In such a construction the integral connectingrod-box upper section can not be removed from the engine through thecylinder because of the large size of the box upper section. Thus it isnecessary to remove such a connecting rod-box upper section through thecrank case of the engine, which necessitates the disassemblage of aconsiderable number of parts of the engine.

The instant invention is an improvement of the above describedconventional connecting rodbearing box structure, providing, in place.of the aforementioned integral connecting rod-box up- .per section, aconnectingrod which isrigidly but removably connected to the .box uppersection and which may be removed from the engine throughthe cylinder.The instantinven- .tion also includes an improved articulated jointbetween a connecting rod and, a bearing .box.

Anaobject of the present, invention is to provide a connectingrod-bearing box structure for a V- type internal combustion engine,having a rigid connecting rod separable from the box for removal fromthe engine through the engine cylinder with which it is associated.

A further object is to provide an improved articulated joint between aconnecting. rod and a bearing box fora V-type internal combustionengine.

.Referring to the drawing forming a part. of this .application,.Figure 1is a vertical transverse sectional View of a portion of an internalcombustion engine embodying the present invention, taken through thecenter of an engine crank,

parts being shown in full and parts being broken away; Fig. 2 is asection of the bearing box and adjacent end of the articulatedconnecting rod, taken on the line IIII of Fig. 1, .a .part being shownin full; Fig. 3 is a section of the bearing .boxupper section andadjacent end of the rigid connecting rod, taken on the line III-III. ofFig. 1;-Fig. l-is an isometric viewof a connecting rod bushing; and Fig.5 is an isometric view .of a connecting rod pin.

Referring to the drawing, only sufiicient of the engine has been shownto illustrate the present invention. The engine is of the V-type,opposite cylinders I and 2 being in the same transverse planeanddiverging from a crank shaft 3. Crank shaft3 is hollow, and is adaptedto containcrank case oil for lubricating the bearings of the connectingrods, as will presently appear.

A bearing boxlI is mounted on a hollow crank 5 of :the crank shaft.Thebox is made in two parts, a lower section 6 and an upper section 'Isecured together by bolts 8, and containing a central orifice 9 andbushing I!) for mounting the box on the crank.

Uppersection I provides a fiat thrust face II directed toward cylinder 2and a concave cylindrically shaped thrust face I2 directed towardcylinder I. Lugs I3,, one on either side of face II and providingtherewith a groove, extend toward cylinder2, and lugs I l, one on eitherside of face I2, extend toward cylinder I. Lugs I3 have aligned orificesI5, there being two orifices in eachlug. A connecting rod i6, extendinginto cylinder, 2, has a lower end portion of tonguelike formationproviding a bottom flat thrust face IT. The tongue-like end portion isdisposed, with a working fit, in the groove between lugs I3 with itsfaceI! in engagement with face II. Orifices I8 are formed in the lower endof the rod in alignment with aligned orifices I5. The aligned orificesare tapered and tapered bolts I9 are disposed in the orifices and aredrawn tight therein by nuts 20. The tapers of the orifices I5 and. I8and bolts, I9 are so directed as to draw faces II and I1 tightlytogether when nuts 29 are drawn up. Therefore piston thruststransmittedthrough rod I6 to the crankshaft are taken by face II and no excessiveshearing force falls on the bolts I9. Bolts I9 rigidly secure rod It .tobox 4 while permitting removal therefrom.

Lugs I I have aligned circular orifices 2| of a radius similar to theradius of the face I2 and in axial alignment therewith. A bushing 22,best shown in Fig.4, is'disposed in the orifices 2I and on the face I2.Bushing 22 is cut away at its central portion providing a slot 23 of thewidth of the face I2 opening toward cylinder I,

I Tabs 24 adjacent the slot overlap faces 25 of the box adjacent faceI2, preventing rotation of the bushing 22 in the orifices 2|.

A cylindrical pin 26, best shown in Fig. 5, is disposed in the bushing.An orifice 21 is formed V in the pin 26, extending from end to endthereof,

An articulated connecting rod 30, extending into cylinder I, and havinga bottom flat .thrust face 3i, is disposed, with a working fit, betweenlugs M with its face 3| in engagement with face 29 and its side facessnugly engaging the adjacent side faces of the slot. An orifice 32 isformed in the lower end of the rod 30 in alignment with orifice 21. Thealigned orifices 21 and 32 are tapered and a tapered bolt 33 is disposedin the orifices and is drawn tight therein by a nut 34. The tapers ofthe orifices 21 and 32 and bolt 33 are so directed as to draw faces 29and 3| tightly together when the nut 34 is drawn up. Therefore pistonthrusts transmitted through rod 30 to the crank shaft are taken by face29 and no excessive shearing force falls on the bolt 33. The thrust istransmitted through pin 26 to the bushing 22 and therefrom to the box 4.Pin 25 floats in bushing 22, being held against endwise displacement byrod 3|] abutting lugs 14 at its sides, and therefore no shearing forcefalls on pin 26.

Rod is rigidly secured to pin 26 by the tapered bolt 33 and fiat faces29 and 3| so that it moves bodily with pin 26, pin 26 being free to rockin bushing 22. Thus rod 30 is pivotally connected to box 4 and isfurther easily removable therefrom. In considering rod thrusts, pin 26may be considered as part of rod 30 and thrusts are thereforetransmitted from rod 39 to upper box section I, disregarding bushing 22which is from a thrust standpoint part of section I.

The connecting rods I6 and 33 have central lubricating oil bores 35 and36 respectively. Crank 5 has an oil passage 3] connecting the hollowinterior of the crank with an oil groove 38 formed in the inner face ofthe bushing l0. Bushing In further has oil orifices 39 and 40 openinginto groove 38, orifice 39 being in line with bore 35 and communicatingtherewith through a passage 4| formed in the upper box section i, andorifice 40 being in line with bore 36 and communicating therewiththrough a passage 42 formed in the upper box section 1, bushing 22 andpin 26, bolt 33 having a centrally disposed groove 43 permitting flow ofoil thereby.

From the foregoing description, it will be seen that rods l6 and 30 maybe separately disconnected from box 4 without disturbance of other partsof the engine, by removal of bolts [9 and 33 respectively, pin 26 andbushing 22 remaining with the box. The rods are removable from theengine through their respective cylinders, they being of a size topermit this, as clearly shown in Fig. 1.

It will further be seen that on account of the size of upper box section1, rod iii if made integral therewith could not be removed from theengine through the cylinder.

Rod i6 takes the place of the conventional rigid rod formed integrallywith the upper section of the box. If desired, it may be employed with aconventional articulated rod comparable to rod 30, or with any box uppersection too large to pass with the rod through the cylinder. Similarly,rod 3!] may be employed with a conventional integral rod-upper boxsection construction if desired.

While there has been hereinbefore described an approved embodiment ofthis invention, it will be understood that many and various changes andmodifications in form, arrangement of parts and details of constructionthereof maybe made without departing from the spirit of the inventionand that all such changesand modifications as fall within the scope ofthe appended claims are contemplated as a part of this invention.

The invention claimed and desired to be secured by Letters Patent is:

1. A connecting rod assembly comprising a bearing box; a connecting rodrigid at its inner end with said bearing box; an articulated connectingrod, said connecting rods being disposed at a V-angle to each other,said bearing box having a cylindrically concave face directed towardsaid articulated rod outer end, and 9. lug at each side of said faceextending toward said rod outer end, each of said lugs having a circularorifice, said orifices and said concave face having a common axis; a pinextending through said orifices in rotatable association therewith andhaving a face opposite and in rotatable association with said concaveface, said pin having a slot between said lugs opening toward said rodouter end, said slot having a bottom face directed toward said rod outerend, said articulated rod having its inner end disposed in said slot andhaving a face opposite said slot face, said opposite faces beingrespectively associated for transmitting thrusts; and a bolt extendingthrough said articulated rod inner end and said pin rigidly connectingsaid articulated rod to said pin.

2. A connecting rod assembly comprising a bearing box; a connecting rodrigid at its inner end with said bearing box; an articulated connectingrod, said connecting rods being disposed at a V-angle to each other,said bearing box having a cylindrically concave face directed towardsaid articulated rod outer end, and a lug at each side of said faceextending toward said rod outer end, each of said lugs having a circularorifice a bushing secured in said orifices in engagement therewith andwith said face, and having a slot between said lugs opening toward saidrod outer end and having a bottom concave face, and said orifices andsaid concave faces having a common axis; a rotatable pin mounted in saidbushing, having a convexly faced portion opposite said bushing concaveface and a slot between said lugs opening toward said rod outer end,said pin slot having a bottom face directed toward said rod outer end,said articulated rod having its inner end disposed in said pin slot andhaving a face opposite said pin slot face, said respective oppositefaces being in aligned thrust association; and a bolt extending throughsaid articulated rod inner end and said pin rigidly connecting saidarticulated rod to said pin.

3. A connecting rod assembly comprising a bearing box; a connecting rodrigid at its inner end with said bearing box; a connecting rodarticulated at its inner end to said box, said connecting rods beingdisposed at a V-angle to each other, said articulated rod inner end andsaid box each being provided with lug means, one of said lug meanshaving a pair of spaced lugs and the other of said lug means having alug extending into said space, said box lug means extendin toward saidarticulated rod outer end and being cylindrically orificed to providebearing means; a pin, said pin being cylindrically faced and mounted atits said facing in said bearing means, said box being cylindricallyconcavely faced concentric with said bearing means,.said pin beingcylindrically faced opposite said box facing, and being in rotatableassociation with said bearing means and with said box facing, said rodlug means being faced and said pin being cut away and faced oppositesaid rod lug'means facing; and a bolt extending through said rod lugmeans and pin rigidly securing said articulated rod and pin together,said respective opposite facings being in aligned thrust association.

4. A connecting rod assembly comprising a bearing box member having anorifice for mounting same on a crank pin; a detachable connecting rodmember for articulation at its outer end to a piston, one of saidmembers having spaced lugs and a thrust face therebetween forming agroove open toward the other of said members and directed crosswise ofthe axis of said orifice, said other member having a tongue snuglyfitting said groove and having an end thrust face opposite and parallelto said groove face; bolts parallel to the axis of said orifice, one ateach side of and spaced from the longitudinal center line of said rodmember, said bolts being tapered and engaging similarly tapered holes insaid lugs and said tongue for drawing said faces in tight thrustengagement and holding said members rigidly together, said thrust facesbeing axially in alignment with said rod member; and a connecting rodmember articulated to said box member, said connecting rod members beingdisposed at a V-angle to each other.

5. A connecting rod assembly comprising a bearing box having an orificefor mounting same on a crank pin; a detachable connecting rod forarticulation at its outer end to a piston, said box having spaced lugsand a thrust face therebetween forming a groove open toward said rod anddirected crosswise of the axis of saidorifice, said rod having a tonguesnugly fitting said groove and having an end thrust face opposite andparallel to said groove face; bolts parallel to the axis of saidorifice, one at each side of and spaced from the longitudinal centerline of said rod, said bolts being tapered and engaging similarlytapered holes in said lugs and said tongue for drawing said faces intight thrust engagement and holding said rod and box rigidly together,said thrust faces being axially in alignment with said rod; and aconnecting rod articulated to said box, said connecting rods beingdisposed at a V-angle to each other.

RALPH MILLER. RICHARD L. JANSEN. JOHN W. ANDERSON.

